Thread core



July 29 935. c, K DUNLAP 2,005,797

THREAD GORE Filed April 17, 1954 lPatented July 2,1935 l I2,006,797

UNITED STATES PATENT OFFICE THREAD Y CORE Charles K. Dunlap, Hartsville, S. C., assignor to Sonoco Products Company, Hartsville, S. C., a corporation of South Carolina Application April, 17, 1934, Serial No. 721,038

` claims. (ci. 242-122) The present invention relates to cores for obstructions to the free wlthdrawalof the thread. thread packages and particularly to tubular cores Various methods have heretofore been sugof paper, preferably slightly conical such as are gested for preventing the swelling of the disused in large numbers in the textile industry as torted fibers at the polished ends of tubular pa- 5 supports for packages or windings of-silk, rayon, per thread cores such as coating with enamel, 5 cotton, or other thread. capping with metal, and the like. The present The type of paper core most commonly used invention contemplates a thread core of novel is formed by winding a sheet or blank of paper character in which means is provided for on a mandrel until a cylindrical or slightly conistrengthening the end 0f the Cere Pest Which the cal tube is built up, the wall of the tube being thread isv drawn eS e thread package rnunted 1'0 several plies in thickness. Generally the tube is on the core isunwound. The improved core com-A,

trimmed to the exact length desired while still DriSeS, in addition t0 the Open-ended Paper tube.

on the mandrel upon which it has been formed a separately formed and applied reinforcing and and while the paper is still soft by reason of the Supporting member, which may be of metal lor presence of the unhardened adhesive which is brous material and which is inserted within the 15 employed to secure the several plies or lamina.- tube and caused to engage the inner wall thereof tions together. Short sections are removed from closely adlaeent the end. The added reinforcingl the ends of the tubular body by cutting knives member preferably comprises a central disc-like so that the tube end surfaces lie in parallel portion, which forms a closure for the end of the planes, the tube being open atboth ends. After tube, and an annuler flange integral with the 20 removal of the core or tube from the mandrel, disc which engages the inner wall of the tube in it is permitted to dry, and subsequent to the drysuch manner that the added member is firmly ing operation one end of the tube is subjected to secured in position- The tube endv iS gl'eettlyv a rounding and polishing operation as by forcstrengthened radially by the "added member.

ing the same against a rapidly rotating die or to which member in its preferred form valso com- 25 a rounding operation performed in some other IJrSeS a Seel fOr the tube end- It 1S net easily manner, as by burning away such portions of the dislodged land in fact cannot accidentally beend as are necessary to insure that a perfectly come dislodged by reason 0f the fat that it 1S smooth surface results. It will be appreciated. wholly enclosed within the tube.

that in unwinding a package of thread from The supperting member iS Particularly edven- 30 a. core such as just described, the thread is contageous when applied to open-ended tubes, one tinuously removed by being drawn axially from end of which has been inturned during the polishthe core and that it is essential that that end ing operation. In such case the supporting and 0f the Cere Pest which the thread mOVeS eS it reinforcing member is so designed, constructed,

is being unWOllnd Shell be quite SrnOOth S0 eS not and applied as to embrace and enclose the in- 35 t catch the thread and Cause brekaig turned end surface of the tube and to seal oi Athis A paper tube constructed by a Wmdmg Opera? surface and render it inaccessible to Water vapor.

non as just described pqssesses an@ it has been 'It will be appreciated that water penetrates more dried a' very Substantlal mechamca'l Strength readily into the fibers at the tube ends than it 40 quite. sufficient under ordinary circumstances for does through the Side Wan Surfaces because of Phe the purpose intended. In use, however, tubes of this kind are generally surrounded by a highly .manner m Whmh the bers are dlsposed m the humidiiied atmosphere such as exists in textile Original formation of the paper Sheet from which mms and the moisture of the atmosphere tends the tube is formed. By effectively sealing off the to penetrate, and does so penetrate the paper end Surfaces Of the tube OI' Core, the rate Of pene- 45 laminations of the thread core, which naturally tration 0f Water inte the bers 0f the Peper iS tends to soften the paper and to weaken the core. therefere greatly reterded- YPreferalllly I Seal 01T In every case where the paper bers of the core both end Surfaces 0f the tube, One Such annuler have been distorted at one end in the polishing Surface being Sealed by the application of the operation, the action of the moisture upon such member just referred to and the other by a coat- 50 distorted bers is such as to cause the fibers to ing Operation, as by dipping in paraflln or the swell and to tend to return to the positions which like. A tube so constructed, and especially when they originally occupied, thus nullifying the efwaterproof paste has been utilized to secure its fect of the polishing operation and causing the various laminations together, will retain its meend of the core to become roughened and form chanical strength to a remarkable degree, even 55 when surrounded by a highly humidifled atmosphere for a long period of time. i

It is frequently desirable to apply to that end As a iinal step, therefore, a tube in accordance with this invention In the drawing:

Figure 1 is an axial section through a paper core having the novel reinforcing and supporting element positioned at one end;

Figure 2 is a perspective view of the upper end of the core so constructed;

Figure 3 is a partial axial section through a core to which a somewhat different form of reinforcing device has been applied;

Figure 4 is a perspective view of one form of reinforcing member; and

Figure 5 is an axial section through one end of a somewhat different type of core and to which a modified form of reinforcing element has been applied.

As previously set forth, the body of the paper core indicated at l0 is preferably formed by shown in' Figures 1 and 3.

Next the reinforcing member, indicated generally at Il, is applied, this member being inserted adapted to receive the inturned annular edge I0' of the tube. Preferably of the tube before is positioned, as shown in Figure 1, in order that this member may be positively secured in position. In some instances, however, the application of glue is-not Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:

1. A core for thread packages comprising a paper tube having an inturnedgannular edge portion at one end and a separately formed annular element secured within the tube, said element having a groove formed therein, the annular edge of the tube being positioned within said groove, for the purpose set forth.

2. In a core for thread packages, in combinatior., a paper tube having an annular inturned edge portion at one end, a separately formed annular element secured within the tube and engaging said edge, and an imperforatc disc secured to said element and closing the tube.

3. A core for thread packages comprising, in combination, a paper tube having an annular inturned portion at one end, a separately formed annular element secured within the tube and extending around and engaging the end surface of said inturned edge, and formed integral with said element and closing the tube, said disc being disposed closely adjacent 2G the tube end.

4. A core for thread packages comprising a paper tube having an inturned annular end'portion, a member within the tube and extending transversely thereof, said member being imperforate and having a portion which has continuous sealing engagement with the wall of the tube and a portion which has continuous sealing engagement with the edge surface of said inturned end portion.

5. A core for thread packages comprising a paper tube having an inturned annular'end portion, an mperorate member within the tube and positioned adjacent said intumed end, said member having a substantially cylindrical portion which has continuous sealing engagement with the wall of the tube and a second substantially cylindrical portion o reduced diameter integral therewith which has continuous sealing engagement with the edge surface oi said inturned end portion.

CHARLES K. DUNLAP. 

